KSP/sksp2024-mcu
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Matrix: Simplify

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This commit is contained in:
Martin Mareš 2024-09-18 10:41:49 +02:00
parent 59e7fbadc9
commit de5465a0fa
1 changed files with 16 additions and 82 deletions
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98
src/matrix/matrix.c
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@ -1,3 +1,4 @@
#include <libopencm3/cm3/systick.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
@ -5,6 +6,14 @@
typedef unsigned char byte;
static void delay_ms(unsigned int ms)
{
systick_clear();
for (unsigned int i=0; i<ms; i++)
while (!systick_get_countflag())
;
}
static void wait(void)
{
for (int i=0; i<7200; i++)
@ -34,10 +43,7 @@ static void set_reg(int reg, int data)
wait();
}
byte display[8];
#if 0
static unsigned char smile[8] = {
static byte display[8] = {
0x66, /* .##..##. */
0x66, /* .##..##. */
0x00, /* ........ */
@ -47,7 +53,6 @@ static unsigned char smile[8] = {
0x66, /* .##..##. */
0x3c, /* ..####.. */
};
#endif
static void refresh_display(void)
{
@ -55,69 +60,6 @@ static void refresh_display(void)
set_reg(i, display[8-i]);
}
static signed char dirs[4][2] = {{1,0}, {0,-1}, {-1,0}, {0,1}};
static byte snake_dir;
#define SNAKE_MAX 65
static byte snake[SNAKE_MAX][2];
static byte snake_tail, snake_head;
static byte food[2];
static unsigned int rng_state = 0xdeadbeef;
static byte buttons[2];
static void gen_food(void)
{
food[0] = (rng_state >> 28) & 7;
food[1] = (rng_state >> 20) & 7;
rng_state *= 0x3771cadb;
}
static void snake_init(void)
{
snake[0][0] = 0;
snake[0][1] = 0;
snake_dir = 3;
snake_tail = 0;
snake_head = 1;
gen_food();
}
static void snake_show(void)
{
memset(display, 0, 8);
for (int i=snake_tail; i != snake_head; i = (i+1) % SNAKE_MAX)
display[snake[i][0]] |= 1 << snake[i][1];
display[food[0]] |= 1 << food[1];
refresh_display();
}
static void snake_step(void)
{
if (buttons[0])
snake_dir = (snake_dir+3) % 4;
else if (buttons[1])
snake_dir = (snake_dir+1) % 4;
int hi = (snake_head + SNAKE_MAX - 1) % SNAKE_MAX;
int x = snake[hi][0] + dirs[snake_dir][0];
int y = snake[hi][1] + dirs[snake_dir][1];
if (x < 0 || x > 7 || y < 0 || y > 7)
return;
snake[snake_head][0] = x;
snake[snake_head][1] = y;
snake_head = (snake_head + 1) % SNAKE_MAX;
if (x == food[0] && y == food[1])
gen_food();
else
snake_tail = (snake_tail + 1) % SNAKE_MAX;
snake_show();
}
int main(void)
{
rcc_clock_setup_pll(&rcc_hse_configs[RCC_CLOCK_HSE8_72MHZ]);
@ -136,10 +78,12 @@ int main(void)
gpio_set(GPIOB, GPIO13);
gpio_clear(GPIOB, GPIO14);
#if 0
// PA0 = left button
// PA1 = right button
gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, GPIO0 | GPIO1);
gpio_set(GPIOA, GPIO0 | GPIO1);
#endif
refresh_display();
set_reg(9, 0);
@ -148,20 +92,10 @@ int main(void)
set_reg(13, 0); // test
set_reg(12, 1); // shutdown
snake_init();
snake_show();
for (;;) {
buttons[0] = buttons[1] = 0;
for (int i=0; i<1000000; i++) {
if (!gpio_get(GPIOA, GPIO0))
buttons[0] = 1;
if (!gpio_get(GPIOA, GPIO1))
buttons[1] = 1;
asm volatile ("");
}
gpio_toggle(GPIOC, GPIO13);
snake_step();
gpio_clear(GPIOC, GPIO13);
delay_ms(100);
gpio_set(GPIOC, GPIO13);
delay_ms(500);
}
}